Wed, 27 Aug 2014 08:19:12 -0400
8046598: Scalable Native memory tracking development
Summary: Enhance scalability of native memory tracking
Reviewed-by: coleenp, ctornqvi, gtriantafill
aoqi@0 | 1 | /* |
aoqi@0 | 2 | * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. |
aoqi@0 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
aoqi@0 | 4 | * |
aoqi@0 | 5 | * This code is free software; you can redistribute it and/or modify it |
aoqi@0 | 6 | * under the terms of the GNU General Public License version 2 only, as |
aoqi@0 | 7 | * published by the Free Software Foundation. |
aoqi@0 | 8 | * |
aoqi@0 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
aoqi@0 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
aoqi@0 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
aoqi@0 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
aoqi@0 | 13 | * accompanied this code). |
aoqi@0 | 14 | * |
aoqi@0 | 15 | * You should have received a copy of the GNU General Public License version |
aoqi@0 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
aoqi@0 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
aoqi@0 | 18 | * |
aoqi@0 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
aoqi@0 | 20 | * or visit www.oracle.com if you need additional information or have any |
aoqi@0 | 21 | * questions. |
aoqi@0 | 22 | */ |
aoqi@0 | 23 | |
aoqi@0 | 24 | /* |
aoqi@0 | 25 | * @test |
aoqi@0 | 26 | * @bug 8032011 |
aoqi@0 | 27 | * @summary biased locking's revoke_bias locks monitor in compiled frame with eliminated lock |
aoqi@0 | 28 | * @run main/othervm -XX:-UseOnStackReplacement -XX:CompileCommand=dontinline,TestLockEliminatedAtDeopt$A.m2 -XX:-BackgroundCompilation -XX:BiasedLockingStartupDelay=0 TestLockEliminatedAtDeopt |
aoqi@0 | 29 | * |
aoqi@0 | 30 | */ |
aoqi@0 | 31 | |
aoqi@0 | 32 | public class TestLockEliminatedAtDeopt { |
aoqi@0 | 33 | |
aoqi@0 | 34 | static class A { |
aoqi@0 | 35 | void m() { |
aoqi@0 | 36 | } |
aoqi@0 | 37 | |
aoqi@0 | 38 | // This lock is not eliminated but biased to main thread on |
aoqi@0 | 39 | // first call |
aoqi@0 | 40 | synchronized void m2(boolean trap) { |
aoqi@0 | 41 | if (trap) { |
aoqi@0 | 42 | new B(); |
aoqi@0 | 43 | } |
aoqi@0 | 44 | } |
aoqi@0 | 45 | } |
aoqi@0 | 46 | |
aoqi@0 | 47 | static class B extends A { |
aoqi@0 | 48 | void m() { |
aoqi@0 | 49 | } |
aoqi@0 | 50 | } |
aoqi@0 | 51 | |
aoqi@0 | 52 | static void m1(boolean trap) { |
aoqi@0 | 53 | A a = new A(); |
aoqi@0 | 54 | // This lock is eliminated by c2 |
aoqi@0 | 55 | synchronized(a) { |
aoqi@0 | 56 | a.m2(trap); |
aoqi@0 | 57 | a.m(); |
aoqi@0 | 58 | } |
aoqi@0 | 59 | } |
aoqi@0 | 60 | |
aoqi@0 | 61 | public static void main(String[] args) { |
aoqi@0 | 62 | for (int i = 0; i < 20000; i++) { |
aoqi@0 | 63 | m1(false); |
aoqi@0 | 64 | } |
aoqi@0 | 65 | // Trigger uncommon trap in A.m2() (class unloaded) and |
aoqi@0 | 66 | // deoptimization of m1() (CHA invalidated). Uncommon trap |
aoqi@0 | 67 | // code locks monitor in m1's frame where's it's eliminated. |
aoqi@0 | 68 | m1(true); |
aoqi@0 | 69 | } |
aoqi@0 | 70 | } |